/*
 *  Copyright 2005 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.forum.subscription;

import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.util.forum.ForumModuleWebConstants;
import com.blandware.atleap.webapp.util.core.WebappUtil;
import com.blandware.atleap.service.forum.ForumManager;
import com.blandware.atleap.common.ForumModuleConstants;
import com.blandware.atleap.model.forum.Topic;
import com.blandware.atleap.model.forum.Forum;
import org.apache.struts.action.*;
import org.apache.commons.validator.GenericValidator;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.List;
import java.lang.reflect.InvocationTargetException;

/**
 * <p>Shows a form where user enters email to subscribe to topic or forum.</p>
 * <p><a href="CallCreateForumSubscriptionAction.java.html"><i>View source</i></a></p>
 *
 * @author Roman Puchkovskiy <a href="mailto:roman.puchkovskiy@blandware.com">
 *         &lt;roman.puchkovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.3 $ $Date: 2006/05/19 09:40:22 $
 * @struts.action path="/forum/subscription/callCreate"
 * name="forumSubscriptionForm"
 * validate="false"
 * @struts.action-forward name="createSubscription"
 * path=".forum.subscription.create"
 * @struts.action-forward name="showForum"
 * path="/forum/forum/show.do"
 * redirect="true"
 * @struts.action-forward name="showForums"
 * path="/forum/forum/showForums.do"
 * redirect="true"
 */
public final class CallCreateForumSubscriptionAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) {

        HttpSession session = request.getSession();

        Long topicId = null;
        Long forumId = null;
        if (!GenericValidator.isBlankOrNull(request.getParameter("forumId"))) {
            try {
                forumId = Long.valueOf(request.getParameter("forumId"));
            } catch (NumberFormatException e) {
            }
        }
        if (!GenericValidator.isBlankOrNull(request.getParameter("topicId"))) {
            try {
                topicId = Long.valueOf(request.getParameter("topicId"));
            } catch (NumberFormatException e) {
            }
        }

        if (forumId == null && topicId == null) {
            ActionMessages errors = new ActionMessages();
            errors.add("noTopicOrForumSpecified", new ActionMessage("forum.subscription.errors.noTopicOrForumSpecified"));
            saveErrors(request, errors);
            return mapping.findForward("showForum");
        }

        session.setAttribute(ForumModuleWebConstants.SUBSCRIPTION_FORUM_ID_KEY, forumId);
        session.setAttribute(ForumModuleWebConstants.SUBSCRIPTION_TOPIC_ID_KEY, topicId);

        boolean isForum = forumId != null;

        ForumManager forumManager = (ForumManager) getBean(ForumModuleConstants.FORUM_MANAGER_BEAN);
        Forum forum = null;
        Topic topic = null;

        List roles = null;

        if (isForum) {
            forum = forumManager.retrieveForum(forumId);
            if (forum == null) {
                // no forum found
                ActionMessages errors = new ActionMessages();
                errors.add("topicOrForumNotFound", new ActionMessage("forum.subscription.errors.forumNotFound"));
                saveErrors(request, errors);
                return mapping.findForward("showForums");
            }
            roles = forum.getRoles();
        } else {
            topic = forumManager.retrieveTopic(topicId);
            if (topic == null) {
                // no topic found
                ActionMessages errors = new ActionMessages();
                errors.add("topicOrForumNotFound", new ActionMessage("forum.subscription.errors.topicNotFound"));
                saveErrors(request, errors);
                return mapping.findForward("showForum");
            }
            roles = topic.getForum().getRoles();
        }

        boolean isForumActive = (isForum ? forum.getActive() : topic.getForum().getActive()).booleanValue();
        if (!isForumActive) {
            // trying to subscribe to non-active forum or its topic
            ActionMessages errors = new ActionMessages();
            errors.add("notActive", new ActionMessage("forum.subscription.errors.notActive"));
            saveErrors(request, errors);
            return mapping.findForward("showForum");
        }

        try {
            if (!WebappUtil.isUserInRole(roles, false, "name", request)) {
                // insufficient rights
                ActionMessages errors = new ActionMessages();
                errors.add("notAllowed", new ActionMessage("forum.subscription.errors.notAllowed"));
                saveErrors(request, errors);
                return mapping.findForward("showForum");
            }
        } catch (Exception e) {
            if (log.isErrorEnabled()) {
                log.error("Exception while checking topic or forum roles", e);
            }
            return mapping.findForward("showForum");
        }

        // save transaction token in request
		saveToken(request);
		return mapping.findForward("createSubscription");
	}
}
